I would say at your price point do what feels good and don't look back. Too many people giving advice in total absolutes has your head spinning.

There is nothing wrong with a suspension fork. Yeah, it adds some weight and may not be totally necessary but at some point you are going to go over some rough stuff and it will smooth out the ride. The purpose in a suspension fork in a bike of this caliber is not to shred a mountain so you don't need a $500 fork. It's to simply emphasize the comfort aspect of riding.

Overall, from what I've seen regarding Trek prices (I've owned 2) whether they are overpriced or not is dependent more on the bike shop and time of year than anything else. Closer to MSRP with any of the major brands (except for Giant maybe) is going to result in a bit of an overpriced bike. Treks being overpriced at every price point is total bull when compared to similar manufacturers (Cannondale, Specialized, etc.). I'd say don't worry about the price and if you love the color and overall look get the bike. I know 3 people that have a 7100 and they all like them. I'd say get one of the two bikes you mentioned and not worry about it; you are going to love either one because it's the bike you'll be riding.